isothermal chart

isothermal chart

[¦ī·sə¦thər·məl ′chärt]
(geophysics)
A map showing the distribution of air temperature (or sometimes sea-surface or soil temperature) over a portion of the earth or at some level in the atmosphere; places of equal temperature are connected by lines called isotherms.
References in periodicals archive ?
Examination of the minimum torque values for the FST run chart shows a general downward trend that is also seen in the standard isothermal chart.